Rotor axial activation modulation of electric machinery due to reverse torque

Abstract

The invention involves installation of a helical nut structure, or a helical nut and ball or roller bearing structure, between an electric machinery transmission shaft and a driven transmission element. Depending on the torque between the electric machinery rotor, and on the loading or driving direction, the corresponding axial displacement of the electric machinery rotor can be controlled, and further the electric machinery characteristics relative to the electric machinery rotor and the electro-magnetic field can be modulated to achieve a desired control structure or testing device.

1. An electric machine, comprising:
 a magnetic field structure; 
 a rotor having a magnetic core, said rotor being arranged to rotate relative to the electric field structure; 
 a helical structure situated between the rotor and a rotary shaft, and a pre-stressed spring situated at one end of the rotor, wherein said helical structure and said spring are arranged to enable axial displacement of the rotor relative to the shaft, and thereby vary electrical machinery characteristics of said electric machine, in response to reverse torque resulting from interaction between said rotor, said magnetic field structure, and a load or driving device as the shaft rotates, 
 wherein when said reverse torque occurs, said rotor is displaced relative to the shaft, thereby varying said electrical machinery characteristics, and 
 wherein an axial stack height of the magnetic core of the rotor is greater than an axial stack height of the magnetic field structure. 
 
   
   
     2. An electric machine as claimed in  claim 1 , wherein said helical structure comprises a helical structure for movably coupling said rotor and shaft. 
   
   
     3. An electric machine as claimed in  claim 1 , wherein said helical structure includes a helical nut on the rotor for engaging a corresponding helical groove structure on the shaft. 
   
   
     4. An electric machine as claimed in  claim 1 , further comprising a second pre-stressed spring situated at an opposite and of the rotor, a direction of said axial displacement depending on a direction of rotation of said shaft. 
   
   
     5. An electric machine as claimed in  claim 1 , wherein said electric machine is a motor. 
   
   
     6. An electric machine as claimed in  claim 1 , wherein said electric machine is a generator. 
   
   
     7. An electric machine as claimed in  claim 1 , wherein said magnetic field structure generates a uniform magnetic field along a length of said rotor. 
   
   
     8. An electric machine as claimed in  claim 1 , wherein electrical machinery characteristics of said rotor vary along a length of the rotor in order to vary magnetic coupling position between the rotor and the magnetic field structure with axial displacement of the rotor and thereby vary operational characteristics of the electrical machine. 
   
   
     9. An electric machine as claimed in  claim 1 , wherein physical properties of said rotor vary along a length of the rotor in order to vary magnetic coupling position between the rotor and the magnetic field structure with axial displacement of the rotor and thereby vary operational characteristics of the electrical machine. 
   
   
     10. An electric machine as claimed in  claim 1 , wherein properties of both said magnetic field structure and said rotor are varied in an axial direction to vary magnetic field density between the rotor and the magnetic field structure and thereby vary operational characteristics of the electrical machine with axial displacement of the rotor. 
   
   
     11. An electric machine as claimed in  claim 1 , wherein axial displacement of the rotor relative to the shaft causes pulling of a control clutch, transmission device, or other control or testing device. 
   
   
     12. An electric machine as claimed in  claim 1 , wherein said rotor is a squirrel-cage rotor having multiple axially-aligned sections having different electrical characteristics, whereby said electrical machinery characteristics are varied by displacement of said sections relative to said magnetic field structure. 
   
   
     13. An electric machine, comprising:
 a magnetic field structure; 
 a rotor having a magnetic core, said rotor being arranged to rotate relative to the electric field structure; 
 a helical structure situated between the rotor and a rotary shaft, and a pre-stressed spring situated at one end of the rotor, wherein said helical structure and said spring are arranged to enable axial displacement of the rotor relative to the shaft, and thereby vary electrical machinery characteristics of said electric machine, in response to reverse torque resulting from interaction between said rotor, said magnetic field structure, and a load or driving device as the shaft rotates, 
 wherein when said reverse torque occurs, said rotor is displaced relative to the shaft, thereby varying said electrical machinery characteristics, 
 wherein an axial stack height of the magnetic core of the rotor is greater than an axial stack height of the magnetic field structure, and 
 further comprising an external device for controlling said axial displacement of said rotor exteriorly. 
 
   
   
     14. An electric machine as claimed in  claim 13 , wherein said external device is selected from the group consisting of a manual, electrical, hydraulic, or mechanical control device. 
   
   
     15. An electric machine as claimed in  claim 13 , wherein an axial length of said rotor is greater than an axial length of said magnetic field structure. 
   
   
     16. An electric machine as claimed in  claim 13 , wherein said electric machine is a generator. 
   
   
     17. An electric machine as claimed in  claim 13 , wherein magnetic field structure generates a uniform magnetic field along a length of said rotor. 
   
   
     18. An electric machine as claimed in  claim 13 , wherein electrical machinery characteristics of said rotor vary along a length of the rotor in order to vary magnetic coupling position between the rotor and the magnetic field structure with axial displacement of the rotor and thereby vary operational characteristics of the electrical machine. 
   
   
     19. An electric machine as claimed in  claim 13 , wherein physical properties of said rotor vary along a length of the rotor in order to vary magnetic coupling position between the rotor and the magnetic field structure with axial displacement of the rotor and thereby vary operational characteristics of the electrical machine. 
   
   
     20. An electric machine as claimed in  claim 13 , wherein properties of both said magnetic field structure and said rotor are varied in an axial direction to vary magnetic field density between the rotor and the magnetic field structure and thereby vary operational characteristics of the electrical machine with axial displacement of the rotor. 
   
   
     21. An electric machine as claimed in  claim 13 , wherein axial displacement of the rotor relative to the shaft causes pulling of a control clutch, transmission device, or other control or testing device. 
   
   
     22. An electric machine as claimed in  claim 13 , wherein said rotor is a squirrel-cage rotor having multiple axially-aligned sections having different electrical characteristics, whereby said electrical machinery characteristics are varied by displacement of said sections relative to said magnetic field structure.